From 2d392c27d78cce8c7b663a17abbd1c699e997b54 Mon Sep 17 00:00:00 2001
From: Tom Ryder <tom@sanctum.geek.nz>
Date: Sun, 21 Aug 2016 17:43:58 +1200
Subject: Cache --quiet option for bc(1) in flag file

As done for grep(1) and ls(1); ed(1) is next
---
 sh/profile.d/bc.sh | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)
 create mode 100644 sh/profile.d/bc.sh

(limited to 'sh/profile.d')

diff --git a/sh/profile.d/bc.sh b/sh/profile.d/bc.sh
new file mode 100644
index 00000000..16200b33
--- /dev/null
+++ b/sh/profile.d/bc.sh
@@ -0,0 +1,22 @@
+# Test that we have metadata about what options this system's bc(1) supports,
+# and try to create it if not
+(
+    # Create a directory to hold metadata about bc
+    bcd=$HOME/.cache/bc
+    if ! [ -d "$bcd" ] ; then
+        mkdir -p -- "$bcd" || exit
+    fi
+
+    # Write bc(1)'s --help output to a file, even if it's empty
+    if ! [ -f "$bcd"/help ] ; then
+        bc --help </dev/null >"$bcd"/help 2>/dev/null || exit
+
+        # Iterate through some useful options and create files to show they're
+        # available
+        set -- quiet
+        for opt ; do
+            grep -q -- --"$opt" "$bcd"/help || continue
+            touch -- "$bcd"/"$opt" || exit
+        done
+    fi
+)
-- 
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